根据句意从括号中选择恰当的介词填空

1. I go to school __________(at / on) 7:30 every morning.

2. The doctor would like to meet her __________(between / among) 8:00 and 9:00 tomorrow morning.

3. -When did Hong Kong return to China?

    -__________(In / On) July 1st, 1997.

4. In the West, there is lots of excitement __________(in / on) Christmas morning when children get up

    very early to open their presents.

5. The Smiths have lived in China __________ (for / since) five years.